It depends. Led light is more power saving and effecient, while hps is for better flowering, which is best for your plants chlorophyll production.
green spectrum
yes
It will not. A HPS lamp has a much lower ignition current than a MH lamp. There are lamps called "multi-vapor' "MVH" that will work in a MH luminaire. you can run metal halide in hps but not hps in halides.
No, a 1000w HPS ballast is designed to power one 1000w HPS light bulb. If you want to power two lights, you would need to use a ballast with enough power output for two lights, like a 2000w HPS ballast.
I would wire them together in a parellel circut. all the lights together, white to white black to black then put your ballast to em. it works like that with my 400 watt mh/hps ballast and 2 250 watt hps bulbs. run 2 hps bulbs with 2 mh bulbs if you can, you get better results.
HPS lights aren't a product that would be sold at just any store. One would need to visit a home improvement store such as the Home Depot, Lowe's, or Ace Hardware to purchase these specific types of lights. These stores would provide several different options in lighting for a home garden system.
One can buy 1000 watt HPS bulbs through the better known webshops like Amazon or eBay. 1000 watt HPS bulbs are most often just to grow specific plants at home.
That would depend on the voltage being utilized. 120, 208, 277?
No!
Yes, all high pressure sodium fixtures require a ballast to operate the fixture's lamp. Most of these industrial fixtures come with a multi tap primary on the ballast so that they can be used on multiple voltages.
Yes the ballast and starter are the same you can run halide in hps, but not hps in halide.
The full name of HPS Ahluwalia is Harpal Singh Ahluwalia.